chore: remove extra code, add vite build, add tests

[mpetrunic]

Description

Quite massive change but in it's core it's simplification of everything.
Changes:

• created single controller WidgetController which reacts to widget changes (it might get crowded at which point we can split into smaller controllers if it makes sense)
  • removed all the context and mixins as it's a widget without navigation and we don't really need context here
• removed walletcontroller. Mostly because it didn't follow logic where you first select network and than wallet connection depends on selected network.
• logic code is separated from components
• added test sample
• added library building (including types)

We can still reuse old code (by checking out old commit) but it's easier if we start from this simplified setup

Related Issue Or Context

Closes: #

How Has This Been Tested? Testing details.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation

Checklist:

• I have commented my code, particularly in hard-to-understand areas.
• I have ensured that all acceptance criteria (or expected behavior) from issue are met
• I have updated the documentation locally and in sygma-docs.
• I have added tests to cover my changes.
• I have ensured that all the checks are passing and green, I've signed the CLA bot

[cloudflare-workers-and-pages]

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